Portable microwave oven



FIG. 1 is a top front view of the portable microwave oven;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a left side elevational view thereof, the right side elevation being a mirror image thereof; and,

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a portable microwave oven, as shown and described. 